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Research & Technology News
Liquid Enables Tunable Microlenses
Mar 1, 2003 — Microlenses play an important role in numerous photonic applications, including imaging, optical data storage and telecommunications. A liquid device developed at Lucent Technologies Inc.'s Bell Lab in Murray Hill, N.J., promises the ability to change its optical properties on demand, enabling control of the focal spot position in three dimensions. Tiny droplets of transparent conductive liquid promise to act as tunable microlenses for a multitude of photonic applications. Courtesy of Lucent...
Monolithic Saturable Absorber Modulates Optical Signal
Mar 1, 2003 — Computers, cell phones and XBoxes are powered by the ability of electrons to control electrons. In the world of photonics, the challenge is to develop the ability of photons to control photons. Researchers at Tampere University of Technology in...
Nano-Islands Control Response Times
Mar 1, 2003 — By tailoring the distance between layers of optically inactive ErAs nano-islands in a semiconductor matrix, researchers at Max Planck Institut für Festkörperforschung in Stuttgart, Germany, and at the University of California, Santa Barbara, have...
Nanoholes Improve Single-Molecule Analysis
Mar 1, 2003 — Researchers at Cornell University in Ithaca, N.Y., have developed a nanostructured sample holder that enables the analysis of single molecules at realistic concentrations. The device, which features arrays of tiny holes in a metal film, has...
Nanowires Form Electrically Driven Laser
Mar 1, 2003 — A team of scientists at Harvard University in Cambridge, Mass., has developed an electrically driven laser based on freestanding semiconductor nanowires. The laser is relatively inexpensive to produce and has the flexibility to be integrated with...
Optimal Pulse Control Deciphered
Mar 1, 2003 — Ultrafast laser pulses can control reactive pathways in chemicals. In a proposed strategy known as adaptive optimal laser pulse control, an algorithm iteratively determines the combination of laser parameters that will best be able to achieve the...
Qubits Teleported over 2 km of Fiber
Mar 1, 2003 — A team of researchers at the University of Geneva has teleported quantum states carried on 1.3-µm photons onto 1.55-µm photons over 2 km of standard dispersion-shifted optical fiber. The experiment, which was described in the Jan. 30 issue of...
Single-Active-Layer Organic LED Yields 16,000 cd/m2
Mar 1, 2003 — By incorporating a 6-nm-thick layer of Teflon, a single-active-layer organic LED fabricated at Tsinghua University in Beijing displays a brightness of 16,000 cd/m2 and a luminous efficiency of 0.85 lm/W. The university researchers suggest that the...
Terahertz Beam Shaping Is Demonstrated
Mar 1, 2003 — The region of the spectrum between long-wave infrared and microwaves promises significant applications in structural imaging, telecommunications and molecular spectroscopy. Detectors and sources of terahertz radiation do not yet approach the...
Tunneling Electrons Stimulate Individual Molecules
Mar 1, 2003 — Using a scanning tunneling microscope, a research team at the University of California, Irvine, has induced photoemission in individual porphyrin molecules on an aluminum oxide film, yielding fluorescence patterns that depend on the molecular...
Two-Color Cooling Proposed for Fermions
Mar 1, 2003 — Carlo Presilla and Roberto Onofrio of the Instituto Nazionale per la Fisica della Materia in Rome propose that the use of a bichromatic optical dipole trap will enable the realization of a deep Fermi degeneracy regime in a mixture of bosonic and...
Adaptive Optics Systems Compared
Feb 1, 2003 — Increasing demands in military observation and intelligence are accelerating research in the field of adaptive optics. Researchers from Kirtland Air Force Base in New Mexico have compared the performance of adaptive optics systems employing an...
Ce:LiCAF Offers 98-mJ, 3-ns UV Pulses
Feb 1, 2003 — A team in Japan has generated 3-ns, 98-mJ pulses of 290-nm radiation with a 1 x 2 x 2-cm Ce:LiCAF power amplifier module. The researchers, from the Institute for Molecular Science in Okazaki, Tokin Corp. in Kumagaya and Tohoku University in Sendai,...
Cesium Condensate Reported
Feb 1, 2003 — Researchers at Universität Innsbruck in Austria have created the first Bose-Einstein condensate of cesium using optical cooling and trapping techniques. They reported their achievement in the Dec. 5 issue of Sciencexpress. To produce the...
Experiment, Theory Expose Light through Slits
Feb 1, 2003 — Using near-field scanning optical microscopy and finite difference time-domain modeling, scientists at Academia Sinica in Taipei, Taiwan, have investigated the propagation of light through a slit. Their findings confirm that the transmittance of...
Fiber Laser Shows Promise for Metrology
Feb 1, 2003 — Scientists at JILA, a collaboration of the University of Colorado and the National Institute of Standards and Technology, all in Boulder, have demonstrated that near-IR erbium-doped fiber lasers can produce well-defined frequency combs for use in...
Fluorescence Detects Atmospheric NO2
Feb 1, 2003 — The atmospheric content of NO2 can serve as an indicator of air pollution, ozone depletion and even a change in climate. So it's no surprise that the Environmental Protection Agency requires states to monitor atmospheric levels of the gas. The...
Free-Electron Laser Pulses Studied
Feb 1, 2003 — Using the frequency-resolved optical gating method, researchers at Argonne National Laboratory in Illinois have measured the phase and amplitude of 530-nm light pulses produced by self-amplified spontaneous emission in the Advanced Photon Source...
Hybridization Improves Photonic Crystals
Feb 1, 2003 — Combining different photonic crystal lattices greatly enhances the performance of optical devices based on the structures, report engineers at the University of Delaware in Newark. In the Dec. 1 issue of Applied Optics, they present simulations of...
In-Well Optical System Offers Time-Lapse Seismic Imaging
Feb 1, 2003 — Weatherford International and its Optoplan group in Trondheim, Norway, have completed the installation of a multistation fiber optic seismic imaging and monitoring array in a well at Izaute Gas Storage in the southwest of France. The tubing-conveyed...
Inspection Systems Monitor Trains
Feb 1, 2003 — The Intercity Express trains in Germany travel at speeds up to 330 km/h, faster than a jet at takeoff. To support such speeds, inspection of the wheels is crucial so that defects may be detected early and remedied immediately, but until recently,...
Ladar Images in Three Dimensions
Feb 1, 2003 — Technology is increasingly important on the battlefield. Now scientists at Massachusetts Institute of Technology's Lincoln Laboratory in Lexington have developed a three-dimensional imaging ladar system for tactical applications. The system offers...
Laser Diode Beam Equalized into Circular Shape
Feb 1, 2003 — Using the twist effect of graded-index fiber optics, scientists at Mitsubishi Electric Corp. in Amagasaki, Japan, have converted an asymmetric laser diode beam into a circular one. Beam qualities went from M2 of 500 in the slow axis and 4 in the...
Laser Safety Board Offers Officer Exam
Feb 1, 2003 — The Board of Laser Safety in Orlando, Fla., a nonprofit organization affiliated with the Laser Institute of America, is offering a certified laser safety officer examination. Requirements for taking the exam include a four-year degree from an...
Liquid Crystal Device Corrects Wavefronts
Feb 1, 2003 — A multinational team of researchers from P.N. Lebedev Physical Institute, Samara State University and Volga Region National Academy of Information and Telecommunications, all in Samara, Russia, TU Delft in the Netherlands and the University of...
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